Golf ball having balance rotation line and manufacturing method therefor

ABSTRACT

A golf ball having a balance rotation line, wherein a balance rotation line is formed on an arbitrary line in which a point for marking the center of gravity of the ball is vertical to a joining line on the ball, thereby enabling accurate putting; and a manufacturing method therefor.

TECHNICAL FIELD

The present invention relates to a golf ball on which a balance rotationline is formed and a method of manufacturing the same, and moreparticularly, a golf ball on which a balance rotation line is formed onan arbitrary line, which perpendicularly connects a marking point of thecenter of gravity and a joining line of the golf ball, for putting byaccurate hitting so that a moving direction of the golf ball matches adirection desired by a golfer after hitting the golf ball, and a methodof manufacturing the same.

BACKGROUND ART

Generally, when a driver shot or iron shot is performed in golf, aposture of a player and a hitting point on a golf ball are important forimproving a driving distance of the golf ball. Particularly, a portionof a golf ball spaced apart from the center of the golf ball by apredetermined distance has to be hit in a downward direction, then thegolf ball reversely rotates and a lift force occurs in a directionperpendicular to a moving direction of the golf ball, and thus, the golfball moves far away. When this principle is applied to golf,particularly, in order to send a golf ball flying far away in a desireddirection, it is important to recognize that each player accuratelychecks the center of gravity of the golf ball to hit the golf ball.

Here, the golf ball is manufactured based on a diameter greater than1.68 inches (42.67 mm) and a weight lighter than 1.62 ounces (45.93 g)to be used for golf. As shown in FIG. 1, generally, the golf ballincludes a core (2) formed at the center thereof and a cover (3) whichsurrounds the core (2).

However, since mass-produced golf balls have centers of gravitydifferent from each other and also have weights different from eachother, it is very difficult to find the center of gravity of each golfball and to set an upper point of the center of gravity as a centralaxis of rotation thereof.

That is, since a core of a golf ball is heavier than a cover thereof,when the core is not positioned at the center the golf ball and isbiased to one side thereof, a heavy side and a light side are generatedin the golf ball causing the golf ball to be an unbalanced state, andthus, movement of the golf ball has to bend in a direction of the heavyside because a weight distribution of left and right sides thereof isnon-uniform when the golf ball rolls.

Accordingly, recently, a putting line has been arbitrarily marked on anouter circumferential surface of a golf ball to be used. However, theputting line causes a problem in that the golf ball is hit inaccuratelydue to the low accuracy of the line.

Further, as shown in FIG. 2, a joining line (30) is formed on a golfball, and when the golf ball is rolled or sent airborne by hitting, inthe case in which the left and right sides of the joining line (30) arenot positioned at the same line as a line connecting both sides of thegolf ball perpendicular to a rotation direction thereof, the accuracy ofthe hitting is low, and thus, it causes a problem in that the golf ballis inaccurately hit due to the low accuracy of the line.

DISCLOSURE The background technology of the present invention isdisclosed as Republic of Korea Patent Registration No. 10-1266061(registered on May 14, 2013).

Technical Problem

The present invention is directed to providing a golf ball on which abalance rotation line is formed so that the center of gravity of thegolf ball is checked, a marking point of the center of gravity forindicating the center of gravity of the golf ball is formed on an outersurface thereof, a balance rotation line is formed on an arbitrary linewhich perpendicularly connects the marking point of the center ofgravity thereof and a joining line thereof, and a straight directivityby rotation and a driving distance are effectively secured when hittingthe golf ball, and a method of manufacturing the same.

Technical Solution

One aspect of the present invention provides a golf ball having aplurality of dimples and a joining line formed on an outercircumferential surface thereof, including a marking point of the centerof gravity formed and marked at a point on a surface of the golf ball towhich a straight line passing through the center of the golf ball fromthe center of gravity thereof reaches, and a balance rotation lineformed on a perpendicular line which perpendicularly connects themarking point of the center of gravity and the joining line, whereinwhen the marking point of the center of gravity is positioned at thejoining line of the golf ball, the balance rotation line is formedperpendicular to the joining line, and when the marking point of thecenter of gravity is positioned at a pole of the golf ball, an arbitraryline among countless lines perpendicular to the joining line is selectedto form the balance rotation line thereon.

Another aspect of the present invention provides a method ofmanufacturing a golf ball on which a balance rotation line is formed,including forming a marking point of the center of gravity to mark themarking point of the center of gravity at a point on a surface of thegolf ball to which a straight line passing through the center of thegolf ball from the center of gravity thereof reaches; identifying ajoining line to identify the joining line of the golf ball on which themarking point of the center of gravity is formed; and forming a rotationline to form a balance rotation line on a perpendicular line whichperpendicularly connects the marking point of the center of gravity andthe joining line, wherein when the marking point of the center ofgravity is positioned at the joining line of the golf ball, the balancerotation line is formed perpendicular to the joining line, and when themarking point of the center of gravity is positioned at a pole of thegolf ball, an arbitrary line among countless lines perpendicular to thejoining line is selected to form the balance rotation line thereon.

DESCRIPTION OF DRAWINGS

FIG. 1 is a view illustrating the inside of a general golf ball.

FIG. 2 is a view illustrating a joining line formed on an outercircumferential surface of the general golf ball.

FIG. 3 is a view illustrating a state of a golf ball according to anembodiment of the present invention.

FIG. 4 is a flowchart for describing a method of manufacturing the golfball according to the embodiment of the present invention.

MODES OF THE INVENTION

Hereinafter, a golf ball on which a balance rotation line is formed anda method of manufacturing the same according to the present inventionwill be described more fully with reference to the accompanyingdrawings. In the description of the present invention, when it isdetermined that a detailed description of the related art of the presentinvention unnecessarily obscures the gist of the present invention, thedetailed description will be omitted.

In addition, as the terms to be described below are the terms set inconsideration of functions of the present invention, the terms may varyaccording to an intention of producers or manufacturers by whichproducts are manufactured. In the drawings, the thicknesses of lines andsizes of components may be exaggerated with respect to actual physicalthicknesses and sizes for convenience of description. Since theembodiments and drawings of the present invention are merely exemplaryembodiments and do not fully cover the technical sprit of the presentinvention, it should be understood that the present invention is tocover all modifications, equivalents, and alternatives falling withinthe spirit and scope of the present invention.

First, resistance generated from a fast flying golf ball includesfrictional resistance generated at a front surface of the golf ball andform resistance generated at the rear thereof. The frictional resistanceis resistance generated at the golf ball due to friction between air andthe golf ball, and the form resistance is resistance generated by avortex of air which is generated at the rear of the golf ball when thegolf ball flies in the air.

The form resistance of the above resistances acts as a major factor fordegrading the properties of a trajectory and a driving distance of thegolf ball, and thus, a plurality of concave grooves, i.e., referred toas dimples 10, are formed on an outer surface of the golf ball to reducethe form resistance.

Since a flow of the air is relatively slow with respect to a golf ballhaving the dimples 10 when compared with a golf ball having no dimples,a vortex generated at the rear of the golf ball, i.e., a wake generationregion, is reduced, and thus, form resistance, which is generated whenthe wake pulls the golf ball in a direction opposite a flying directionthereof, is decreased.

When dimples are arranged on a surface of the golf ball, the dimples aredesigned using various polyhedrons made by dividing a surface of asphere into a plurality of circles. For example, there are many types ofdivided compositions of the sphere such as a spherical tetrahedronhaving four spherical triangles, a spherical hexahedron having sixspherical quadrangles, a spherical octahedron having eight sphericaltriangles, a spherical dodecahedron having 12 spherical pentagons, aspherical icosahedron having 20 spherical triangles, etc.

Further, the dimples are arranged by additionally subdividing the abovespherical polyhedrons to classify the surface of the sphere into aspherical 20-12 polyhedron, a spherical 6-8 polyhedron, etc. However,although all of the divided compositions are divided into differentspherical polyhedrons from each other to arrange the dimples, they mayeventually overlap each other in spheres having the same diameter.

Nevertheless, the reality is that a golf ball having dimples arranged bya new divided composition is manufactured. The reason is that the size,depth, shape of each dimple may vary because the sizes of surface areasof faces of the polyhedron may vary according to the type of dividedcomposition when the dimples are arranged on an entire surface of asphere.

As a result, new divided compositions are continuously made because aflight characteristic varies according to arrangement of each dimple.Further, when dimples are arranged on a surface of a sphere using theabove division method of the spherical polyhedron, the dimples arrangedsymmetrical to each other within one face of the polyhedron make anexcellent flight characteristic when compared with asymmetricalarrangement thereof even in the same polyhedron.

Since the resistance of air is further uniform in a low speed regionfrom a peak of a trajectory to the ground to which a golf ball dropswhile the golf ball flies, wobbling of the golf ball is reduced, andthus, the golf ball lands with a stable arcing trajectory.

Pressure drag more affects a large dimple than a small dimple in aflying region from a hitting point of the golf ball to the peak of thetrajectory, i.e., a high speed region, whereas the pressure drag lessaffects the large dimple than a small dimple in the low speed region.

Accordingly, a new method of dividing a surface of a golf ball sphereand an arrangement of dimples on the surface of the divided sphere areimportant factors in order that the golf ball has a more uniform landingproperty and an excellent driving distance property.

Further, although an upper portion and lower portion of a golf ball havebeen formed identically by forming the golf ball having the dimples onan outer surface thereof by joining an upper mold and a lower mold in aprocess of manufacturing the golf ball, the dimples are arranged withoutregular criteria or rules. In addition, a setup of the rules isdifficult to arrange about 500 dimples within a diameter of 42.67 mm.

Accordingly, recently, various studies on arrangement, numbers, varioustypes of sizes, volumes, and forms have been conducted to furtherincrease a driving distance of a golf ball and to improve theaerodynamic symmetry of the golf ball.

Further, the golf ball is manufactured by manufacturing a core andpressing half covers from directions of both sides thereof. However,when the golf ball is carefully checked, a joining line caused byjoining the half covers is formed minutely.

In addition to the arrangement of the dimples for rotation of the golfball, a uniform weight distribution of left and right sides of a golfball based on a rotation line, and a joining line 30 positioned at thesame line as a line connecting the left and right sides based on therotation line when a golf ball rolls are very important factors.

Accordingly, an embodiment of the present invention is directed tofinding the center of gravity of the golf ball, to forming a markingpoint of the center of gravity for indicating the center of gravity onan outer surface of the golf ball, to forming a balance rotation line 40on an arbitrary line which perpendicularly connects the marking point ofthe center of gravity thereof and a joining line thereof so that astraight directivity by rotation and a driving distance are moreeffectively secured when hitting the golf ball.

That is, when the marking point of the center of gravity of the golfball is positioned on the rotation line of the golf ball, after hittingthe golf ball, since the center of gravity of the golf ball is in abalanced state based on the rotation line, wobbling of the golf ball isprevented while the golf ball rotates and rolls, and thus, the straightdirectivity by rotation and the driving distance of the golf ball can besecured.

Here, when the joining line is formed asymmetrical to the lineconnecting left and right sides based on the rotation line of the golfball and the golf ball rotates and rolls by hitting, resistancealternately acts on left and right sides of the joining line based onthe rotation line, and thus the wobbling of the golf ball is generated.Thus, in the embodiment of the present invention, the balance rotationline 40 is formed on an arbitrary line which perpendicularly connectsthe marking point of the center of gravity thereof and a joining linethereof so that the joining line is positioned symmetrical to the lineconnecting the left and right sides based on the rotation line, therebypreventing the wobbling of the golf ball when the golf ball straightlyrolls by hitting the golf ball.

As shown in FIG. 3, a plurality of dimples and a joining line are formedon an outer circumferential surface of a golf ball 1 according to theembodiment of the present invention, and a marking point of the centerof gravity 20 and a balance rotation line 40 are formed on an outersurface of the golf ball 1.

The center of gravity of the golf ball 1 is found, and the marking pointof the center of gravity 20 is formed on a cover, i.e., the outersurface of the golf ball 1, to recognize the center of gravity thereof.

According to the embodiment of the present invention, in the case inwhich salt water having a specific gravity greater than water is usedfor marking the marking point of the center of gravity 20 on the surfaceof the golf ball, when the golf ball is put into the salt water, a partof the golf ball is exposed on a surface of the salt water, and at thistime, the marking point of the center of gravity is marked at one of anexposed top point and an opposite point symmetrical to the exposed toppoint. Here, since it is difficult to mark the marking point of thecenter of gravity at a point in the salt water, the marking point of thecenter of gravity 20 may be marked at the exposed top point.

That is, the exposed top point where the marking point of the center ofgravity 20 is marked is formed at a point of the surface of the golfball to which a straight line passing through the center of the golfball from the center of gravity thereof reaches.

Here, a method of finding the center of gravity of the golf ball andmarking the marking point of the center of gravity on the outer surfaceof the golf ball is described using the salt water, but is not limitedthereto.

Further, as the balance rotation line 40 is formed on an arbitrary linewhich perpendicularly connects the marking point of the center ofgravity 20 and the joining line 30, the balance rotation line 40 isformed by a marker or printed on the outer surface of the golf ball, andthus may not be removed easily.

In other words, as the balance rotation line 40 is marked for easilyrecognizing a straight direction of the golf ball by a user, a weightdistribution of left and right sides of the golf ball is uniformlyformed based on the balance rotation line 40, and the joining line 30 ispositioned at the same line as a line connecting left and rights sidesbased on the rotation line when a golf ball rolls, and thus, afterhitting the golf ball, the straight directivity of the golf ball can beimproved.

Further, even when the golf ball is sent flying far away by hitting, adriving distance may also be increased due to the improvement of thestraight directivity of the golf ball.

Here, there are a case in which the marking point of the center ofgravity 20 for indicating the center of gravity of the golf ball ispositioned on a joining line of the golf ball and a case in which it ispositioned on a pole of the golf ball. When the marking point of thecenter of gravity is positioned on the joining line of the golf ball,the balance rotation line 40 is formed perpendicular to the joining line30, and when the marking point of the center of gravity is positioned ona pole of the golf ball, an arbitrary line among countless linesperpendicular to the joining line is selected to form the balancerotation line 40 thereon.

Meanwhile, as shown in FIG. 4, a method of manufacturing the golf ballaccording to the embodiment of the present invention includes forming amarking point of the center of gravity (S10), identifying a joining line(S20), and forming a rotation line (S30).

The forming of the marking point of the center of gravity (S10) includesforming the marking point of the center of gravity at a point on asurface of the golf ball to which a straight line passing through thecenter of the golf ball from the center of gravity thereof reaches.Here, before forming the marking point of the center of gravity 20 on anouter surface of the golf ball, the center of gravity of each golf ballhas to be found first.

After finding the center of gravity of the golf ball and forming themarking point of the center of gravity 20 on the outer surface of thegolf ball, the joining line 30 generated in a process of manufacturingthe golf ball is identified.

That is, the golf ball is manufactured by manufacturing a spherical core2 and a cover 3. The cover 3 is divided into two half covers, the halfcovers are pressed from directions of both sides thereof to surround thecore 2, and at this time, the joining line 30, i.e., a line generatedwhen the hemispherical covers are joined, is made.

After identifying the joining line of the golf ball, the forming of therotation line (S30) is performed to form a balance rotation line.

That is, the balance rotation line 40 is formed on a perpendicular lineperpendicularly connecting the marking point of the center of gravityand the joining line. When the marking point of the center of gravity ispositioned on the joining line of the golf ball, the balance rotationline is formed perpendicular to the joining line, and when the markingpoint of the center of gravity is positioned on a pole of the golf ball,an arbitrary line among countless lines perpendicular to the joiningline is selected to form the balance rotation line 40 thereon.

Here, since the balance rotation line 40 is formed perpendicular to thejoining line 30, a moving direction of the golf ball desired by a golferis disposed to match the balance rotation line 40 when hitting the golfball. Thus, the golf ball rotates along the balance rotation line 40when airborne or rolling, thereby contributing to improved drivingdistance and accurate putting.

The above description exemplarily describes the present invention andone skilled in the art may understand that the present invention can bevariously modified without changing the essential features of thepresent invention. Therefore, the embodiments and accompanying drawingsdisclosed herein are for the purpose of describing the technical spritof the present invention only and the scope of the technical sprit isnot intended to be limited by the embodiments and accompanying drawings.The scope of the present invention should be defined by the appendedclaims, and all technical concepts equivalent to the foregoing should beinterpreted to be included within the scope of the present invention.

INDUSTRIAL APPLICABILITY

According to the embodiment of the present invention, since a balancerotation line is formed on an arbitrary line which perpendicularlyconnects a marking point of the center of gravity of the golf ball and ajoining line of the golf ball, a moving direction of the golf balldesired by a golfer matches the balance rotation line after hitting thegolf ball, and thus, the number of slices or hooks are decreased whendriver or iron shots are performed, and a straight directivity byrotation and a driving distance can also be effectively secured.

1. A golf ball having a plurality of dimples and a joining line formedon an outer circumferential surface thereof, comprising: a marking pointof the center of gravity formed and marked at a point on a surface ofthe golf ball to which a straight line passing through the center of thegolf ball from the center of gravity thereof reaches; and a balancerotation line formed on a perpendicular line which perpendicularlyconnects the marking point of the center of gravity and the joiningline, wherein when the marking point of the center of gravity ispositioned at the joining line of the golf ball, the balance rotationline is formed perpendicular to the joining line, and when the markingpoint of the center of gravity is positioned at a pole of the golf ball,an arbitrary line among countless lines perpendicular to the joiningline is selected to form the balance rotation line thereon.
 2. A methodof manufacturing a golf ball on which a balance rotation line is formed,comprising: forming a marking point of the center of gravity to mark themarking point of the center of gravity at a point on a surface of thegolf ball to which a straight line passing through the center of thegolf ball from the center of gravity thereof reaches; identifying ajoining line to identify the joining line of the golf ball on which themarking point of the center of gravity is formed; and forming a rotationline to form a balance rotation line on a perpendicular line whichperpendicularly connects the marking point of the center of gravity andthe joining line, wherein when the marking point of the center ofgravity is positioned at the joining line of the golf ball, the balancerotation line is formed perpendicular to the joining line, and when themarking point of the center of gravity is positioned at a pole of thegolf ball, an arbitrary line among countless lines perpendicular to thejoining line is selected to form the balance rotation line thereon.